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The Midnight Sun is a natural phenomenon that occurs between summer months in places north of the Arctic Circle and south of the Antarctic Circle, when the sun remains visible at midnight (and 24 hours a day). also).
Around the solstice (June 21 in the north and December 22 in the south) the sun is visible for a total of 24 hours. The number of days per year with possible midnight sun increases the more for either pole the location is situated. Although almost determined by polar circles, in practice the midnight sun can be seen up to 90 km outside the polar circle.
Record of the "midnight sun" occurring in the Icelandic summer by US photographer Joe Capra
The opposite phenomenon, the polar night, occurs in winter when the sun stays below the horizon all day long.
Polar Night - Norilsk, Russian city, has three months without sunrise
Countries and populations affected by the midnight sun are limited to those living near the Arctic Circle, such as Canada (Yukon, Northwest Territories and Nunavut), Greenland, Iceland, Finland, Satmi, Norway, Russia, Sweden and the United States. United States (Alaska).
A quarter of Finland's territory is north of the Arctic Circle. At the northernmost point of the country, the sun does not set for 60 days during the summer. In Svalbard, Norway, Europe's northernmost inhabited region, there are no sunsets around 19 April until 23 August. At the extreme poles, the sun can be uninterruptedly visible for a period of one semester. At the poles themselves, the sun only rises and sets once a year.